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@wikipedia


Amount of Heat Flow per unit of area per unit of heat energy transfer across unit area in unit time:

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j_hH = \frac{\delta E_hH}{\delta SA \cdot \delta t}


For the 
 continuum body the heat flux model is adequately described by Fourier's law:

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{\bf j}_H = \lambda \cdot {\bf \nabla} T

where

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body\lambda

thermal conductivity of the continuum body


The heat flux 

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bodyj_H
 is related to heat flow 
LaTeX Math Inline
bodyq_H
 as:

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j_H = \frac{q_H}{A}

 where

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bodyA

heat transfer area


See also

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Physics / Thermodynamics / Heat Transfer / Heat flow

...